Switch to using HuggingFace tokenizers

This commit is contained in:
Yiorgis Gozadinos 2025-11-14 14:47:01 +02:00
parent fe7d0c5c24
commit 541552215e
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7 changed files with 31 additions and 103 deletions

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@ -5,6 +5,11 @@
### Changed ### Changed
- **BREAKING: Chunking Tokenizer**: Switched from tiktoken to HuggingFace tokenizers for consistency with docling-serve
- Default tokenizer changed from tiktoken "gpt-4o" to "Qwen/Qwen3-Embedding-0.6B"
- New `chunking_tokenizer` config option in `ProcessingConfig` for customization
- Removed `tiktoken` dependency
- `download-models` CLI command now also downloads the configured HuggingFace tokenizer
- **Evaluations**: Refactored QA benchmark to run entire dataset as single evaluation for better Logfire experiment tracking - **Evaluations**: Refactored QA benchmark to run entire dataset as single evaluation for better Logfire experiment tracking
- **Evaluations**: Added `.env` file loading support via `python-dotenv` dependency - **Evaluations**: Added `.env` file loading support via `python-dotenv` dependency

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@ -1,6 +1,4 @@
from typing import TYPE_CHECKING, ClassVar from typing import TYPE_CHECKING
import tiktoken
from haiku.rag.config import Config from haiku.rag.config import Config
@ -16,21 +14,25 @@ class Chunker:
Args: Args:
chunk_size: The maximum size of a chunk in tokens. chunk_size: The maximum size of a chunk in tokens.
tokenizer_name: HuggingFace model name for tokenization.
""" """
encoder: ClassVar[tiktoken.Encoding] = tiktoken.encoding_for_model("gpt-4o")
def __init__( def __init__(
self, self,
chunk_size: int = Config.processing.chunk_size, chunk_size: int = Config.processing.chunk_size,
tokenizer_name: str = Config.processing.chunking_tokenizer,
): ):
from docling_core.transforms.chunker.hybrid_chunker import HybridChunker from docling_core.transforms.chunker.hybrid_chunker import HybridChunker
from docling_core.transforms.chunker.tokenizer.openai import OpenAITokenizer from docling_core.transforms.chunker.tokenizer.huggingface import (
HuggingFaceTokenizer,
)
from transformers import AutoTokenizer
self.chunk_size = chunk_size self.chunk_size = chunk_size
tokenizer = OpenAITokenizer( self.tokenizer_name = tokenizer_name
tokenizer=tiktoken.encoding_for_model("gpt-4o"), max_tokens=chunk_size
) hf_tokenizer = AutoTokenizer.from_pretrained(tokenizer_name)
tokenizer = HuggingFaceTokenizer(tokenizer=hf_tokenizer, max_tokens=chunk_size)
self.chunker = HybridChunker(tokenizer=tokenizer) self.chunker = HybridChunker(tokenizer=tokenizer)
@ -51,4 +53,4 @@ class Chunker:
return [self.chunker.contextualize(chunk) for chunk in chunks] return [self.chunker.contextualize(chunk) for chunk in chunks]
chunker = Chunker() chunker = Chunker()

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@ -55,6 +55,7 @@ class ProcessingConfig(BaseModel):
context_chunk_radius: int = 0 context_chunk_radius: int = 0
markdown_preprocessor: str = "" markdown_preprocessor: str = ""
converter: str = "docling-local" converter: str = "docling-local"
chunking_tokenizer: str = "Qwen/Qwen3-Embedding-0.6B"
class OllamaConfig(BaseModel): class OllamaConfig(BaseModel):

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@ -1,9 +1,6 @@
import asyncio
import importlib import importlib
import importlib.util import importlib.util
import sys import sys
from collections.abc import Callable
from functools import wraps
from importlib import metadata from importlib import metadata
from pathlib import Path from pathlib import Path
from types import ModuleType from types import ModuleType
@ -11,42 +8,6 @@ from types import ModuleType
from packaging.version import Version, parse from packaging.version import Version, parse
def debounce(wait: float) -> Callable:
"""
A decorator to debounce a function, ensuring it is called only after a specified delay
and always executes after the last call.
Args:
wait (float): The debounce delay in seconds.
Returns:
Callable: The decorated function.
"""
def decorator(func: Callable) -> Callable:
last_call = None
task = None
@wraps(func)
async def debounced(*args, **kwargs):
nonlocal last_call, task
last_call = asyncio.get_event_loop().time()
if task:
task.cancel()
async def call_func():
await asyncio.sleep(wait)
if asyncio.get_event_loop().time() - last_call >= wait: # type: ignore
await func(*args, **kwargs)
task = asyncio.create_task(call_func())
return debounced
return decorator
def get_default_data_dir() -> Path: def get_default_data_dir() -> Path:
"""Get the user data directory for the current system platform. """Get the user data directory for the current system platform.
@ -144,7 +105,7 @@ def load_callable(path: str):
def prefetch_models(): def prefetch_models():
"""Prefetch runtime models (Docling + Ollama as configured).""" """Prefetch runtime models (Docling + Ollama + HuggingFace tokenizer as configured)."""
import httpx import httpx
from haiku.rag.config import Config from haiku.rag.config import Config
@ -157,6 +118,11 @@ def prefetch_models():
# Docling not installed, skip downloading docling models # Docling not installed, skip downloading docling models
pass pass
# Download HuggingFace tokenizer
from transformers import AutoTokenizer
AutoTokenizer.from_pretrained(Config.processing.chunking_tokenizer)
# Collect Ollama models from config # Collect Ollama models from config
required_models: set[str] = set() required_models: set[str] = set()
if Config.embeddings.provider == "ollama": if Config.embeddings.provider == "ollama":
@ -179,4 +145,4 @@ def prefetch_models():
"POST", f"{base_url}/api/pull", json={"model": model} "POST", f"{base_url}/api/pull", json={"model": model}
) as r: ) as r:
for _ in r.iter_lines(): for _ in r.iter_lines():
pass pass

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@ -31,7 +31,6 @@ dependencies = [
"python-dotenv>=1.2.1", "python-dotenv>=1.2.1",
"pyyaml>=6.0.3", "pyyaml>=6.0.3",
"rich>=14.2.0", "rich>=14.2.0",
"tiktoken>=0.12.0",
"typer>=0.19.2,<0.20.0", "typer>=0.19.2,<0.20.0",
"watchfiles>=1.1.1", "watchfiles>=1.1.1",
] ]

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@ -1,5 +1,6 @@
import pytest import pytest
from datasets import Dataset from datasets import Dataset
from transformers import AutoTokenizer
from haiku.rag.chunker import Chunker from haiku.rag.chunker import Chunker
from haiku.rag.config import Config from haiku.rag.config import Config
@ -20,10 +21,13 @@ async def test_chunker(qa_corpus: Dataset):
# Ensure that the text is split into multiple chunks # Ensure that the text is split into multiple chunks
assert len(chunks) > 1 assert len(chunks) > 1
# Load tokenizer for verification
tokenizer = AutoTokenizer.from_pretrained(chunker.tokenizer_name)
# Ensure that chunks are reasonably sized (allowing more flexibility for structure-aware chunking) # Ensure that chunks are reasonably sized (allowing more flexibility for structure-aware chunking)
total_tokens = 0 total_tokens = 0
for chunk in chunks: for chunk in chunks:
encoded_tokens = Chunker.encoder.encode(chunk, disallowed_special=()) encoded_tokens = tokenizer.encode(chunk, add_special_tokens=False)
token_count = len(encoded_tokens) token_count = len(encoded_tokens)
total_tokens += token_count total_tokens += token_count
@ -34,7 +38,7 @@ async def test_chunker(qa_corpus: Dataset):
assert token_count > 5 # Ensure chunks aren't too small assert token_count > 5 # Ensure chunks aren't too small
# Ensure that all chunks together contain roughly the same content as original # Ensure that all chunks together contain roughly the same content as original
original_tokens = len(Chunker.encoder.encode(doc_text, disallowed_special=())) original_tokens = len(tokenizer.encode(doc_text, add_special_tokens=False))
# Due to structure-aware chunking, we might have some variation in token count # Due to structure-aware chunking, we might have some variation in token count
# but it should be reasonable # but it should be reasonable

49
uv.lock
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@ -1206,7 +1206,6 @@ dependencies = [
{ name = "python-dotenv" }, { name = "python-dotenv" },
{ name = "pyyaml" }, { name = "pyyaml" },
{ name = "rich" }, { name = "rich" },
{ name = "tiktoken" },
{ name = "typer" }, { name = "typer" },
{ name = "watchfiles" }, { name = "watchfiles" },
] ]
@ -1266,7 +1265,6 @@ requires-dist = [
{ name = "python-dotenv", specifier = ">=1.2.1" }, { name = "python-dotenv", specifier = ">=1.2.1" },
{ name = "pyyaml", specifier = ">=6.0.3" }, { name = "pyyaml", specifier = ">=6.0.3" },
{ name = "rich", specifier = ">=14.2.0" }, { name = "rich", specifier = ">=14.2.0" },
{ name = "tiktoken", specifier = ">=0.12.0" },
{ name = "typer", specifier = ">=0.19.2,<0.20.0" }, { name = "typer", specifier = ">=0.19.2,<0.20.0" },
{ name = "voyageai", marker = "extra == 'voyageai'", specifier = ">=0.3.5" }, { name = "voyageai", marker = "extra == 'voyageai'", specifier = ">=0.3.5" },
{ name = "watchfiles", specifier = ">=1.1.1" }, { name = "watchfiles", specifier = ">=1.1.1" },
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